EBK LIFE: THE SCIENCE OF BIOLOGY
EBK LIFE: THE SCIENCE OF BIOLOGY
11th Edition
ISBN: 8220103935432
Author: Sadava
Publisher: MAC HIGHER
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Chapter 6.3, Problem 3R
Summary Introduction

To review:

The role of cell membrane in maintaining potassium ion (K+) imbalance in neurons and their elimination by K+ membrane channels.

Introduction:

Cells generally have membranes composed of lipids and proteins. The lipids present in the membranes are selectively permeable and does not allow all the substances to enter the cell. The proteins present on the cell membrane form a channel-like structure known as ion channels. Some of these channels are also known as gates.

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Which of the following statements about voltage gated channels is true?     Voltage-gated sodium channels open at a higher (more positive) membrane potential than do potassium-gated channels     Voltage-gated sodium channels open at a lower (more negative) membrane potential than do potassium-gated channels     Sodium- and postassium-gated channels open at about the same membrane potential, but they have different effects because there are different numbers of the two kinds of channels in neuron cell membranes
Fill in the diagram, your illustration should demonstrate for each phase of the AP: 1. The relative concentration of K and Na 2. The relative voltage across the membrane 3. Any movement across the membrane of K and NA 4. The three kinds of channels in the membrane, and their state (open or closed) 5. Finally, indicate on the graph of the AP which phases correspond to hyper- polarization and which phases correspond to de- polarization Outside Outside Inside Inside Outside Inside Outside 1 Outside Inside Inside
During neuronal signaling, a change in membrane potential will cause sodium channelsto open and let Na+ ions diffuse down their concentration gradient into the cell. Whichof the following helps establish the concentration gradient necessary for this process tooccur?
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